# StackHal.com — Developer Tools & Infrastructure Diagnostics

> Free online developer tools and diagnostics by backend engineer Bahdan Hal: Caddyfile transpiler, Apple PKPass inspector, CIDR overlap matrix, DMARC/BIMI domain inspector, technical SEO & GEO audits.

## Primary developer tools

- [AI Studio Local File Sync & Codebase Context](https://stackhal.com/ai-studio-local-file-sync): open-source Chrome extension for packing repository context, reviewing AI-generated diffs, and syncing approved files to a local workspace
- [Nginx & Apache to Caddyfile Converter](https://stackhal.com/tools/caddy-transpiler): real-time transpiler converting Nginx server blocks and Apache .htaccess to clean Caddyfiles
- [Apple Wallet (.pkpass) Inspector](https://stackhal.com/tools/pkpass-inspector): debug Apple Wallet passes, examine manifest hashes, JSON schemas, and preview passes
- [CIDR Subnet Overlap Matrix](https://stackhal.com/tools/cidr-matrix): visual IPv4/IPv6 subnet calculator, collision detector, and available IP range planner
- [Domain Email Security Inspector](https://stackhal.com/tools/domain-inspector): 1-click verification for DMARC, BIMI, MTA-STS, TLS-RPT, and SPF
- [BIMI Studio & SVG Tiny 1.2 PS](https://stackhal.com/tools/bimi-studio): BIMI logo sanitizer, safe-zone validator, and live email inbox simulator
- [Technical SEO Audit](https://stackhal.com/tools/seo-audit): deterministic crawling, redirect loops, canonical integrity, robots.txt, and sitemap audits
- [GEO Readiness Analyzer](https://stackhal.com/tools/geo-audit): deterministic answer-engine crawlability and AI readiness analysis
- [Favicon Suite Generator](https://stackhal.com/tools/favicon-suite): multi-size ICO, PNG, and SVG manifest builder
- [Regex Engine Transpiler](https://stackhal.com/tools/regex-transpiler): dialect converter for PCRE, JavaScript, Python, and Go regex
- [DNS Delegation & Propagation DAG Tracer](https://stackhal.com/tools/dns-dag): visual DNS resolution hierarchy and nameserver health tracer
- [Apple Universal Links & Android App Links Validator](https://stackhal.com/tools/app-links): assetlinks.json and apple-app-site-association checker
- [CORS & Preflight Sandbox](https://stackhal.com/tools/cors-sandbox): interactive CORS header and preflight diagnostics

## Ecosystem applications

- [Bahdan Hal Portfolio](https://bahdanhal.pl/): backend consulting and production engineering
- [IleZa.pl](https://ileza.pl/): Manual editorial fair prices for any product category in Poland, plus a salary calculator

## Data access

- Public read-only MCP endpoint: `https://stackhal.com/mcp`
- Public MCP tools: `audit_website_seo`, `analyze_geo_readiness`, `inspect_domain_security`, `transpile_to_caddyfile`, `inspect_apple_pkpass`, `calculate_cidr_overlap`, `generate_favicon_suite`, `transpile_regex_engine`, `trace_dns_delegation`, `validate_app_links`, `diagnose_cors_policy`.
- No account or API key is required.